7.2 CHAPTER 7. MECHANICAL PROPERTIES OF MATTER
Conclusions:
- What do you observe about the relationshipbetween the applied force
and the extension? - Determine the gradient (slope) of the graph.
- Now calculate the spring constant for your spring.
See simulation: VPnni at http://www.everythingscience.co.za)
See video: VPnnz at http://www.everythingscience.co.za
Example 1: Hooke’s Law I
QUESTION
A spring is extended by7 cm by a force of 56 N.
Calculate the spring constant for this spring.
SOLUTION
F =−kx
56 =−k× 0 , 07
k =
− 56
0 , 07
=−800 N· m−^1
Example 2: Hooke’s Law II
QUESTION
A spring of length 20cmstretches to 24cm whena load of 0,6N is appliedto it.
- Calculate the springconstant for the spring.
- Determine the extension of the spring if a load of 0,5N is applied to it.